[Paraview] Crash when using the Information Tab in Object Inspector

[Paul Edwards]

Clicking on a leaf node for a composite dataset will cause paraview to crash
in the master branch.

To reproduce:
    Sphere Source
    Group Datasets
    Click on Information in Object inspector
    Click on the leaf node [ it crashes here ]

if you set a breakpoint at pqProxyInformationWidget.cxx:468 it will show
where the pointer to vtkPVInformationWidget is stored in the QTreeWidgetItem
- the second stop in the steps above is the leaf node for the dataset.  If
you then set a breakpoint in ~vtkPVDataInformation you can see where it is
deleted (but not removed from the QTreeWidgetItem).  It was obvious to me
what should be happening here.

Regards,
Paul

BTW I've submitted to mantis - 12571
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